Dear Kawa,
Which vendor? if ericsson check the counters CNRELCONG and TNRELCONG, are they increased,if yes, this mean that you needed this TRX, and you shouldn’t lock it. Unless you are ready with cell load sharing strategy. on the other hand, in BBH number of frequencies = number of TRXs, and when you lock a TRX, then you are locking the Frequency you assigned to it, this means hoping will not include this frequency.
Regards,